I  U  P  A  C





News & Notices

Organizations & People

Standing Committees

Divisions

Projects

Reports
..By Year
..By Division
..Other Committees
..Provisionals

Publications

Symposia

AMP

Links of Interest

Search the Site

Home Page

 

 

Pure Appl. Chem., Vol. 70, No. 1, pp. 237-257, 1998.


History of the recommended atomic-weight values*

Tantalum

Z
E
Year
Ar(E)
U[Ar(E)]
D[Ar(E)]
D[Ar(E)]
U[Ar(E)]
73 Ta 1882 182.56 0.1 1.6 16
1894 182.6 0.3 1.7 5.5
1897 182.84 0.03 1.9 63
1900 182.8 0.3 1.9 6.2
1903 183 3 2.1 0.68
1907 181 0.3 0.052 0.17
1910 181.5 0.3 0.55 1.8
1931 181.4 0.3 0.45 1.5
1936 180.88 0.03 -0.068 -2.3
1953 180.89 0.03 -0.058 -1.9
1961 180.948 0.003 0.0001 0.033
1969 180.9479 0.0003 0 0
1979 180.9479 0.0001

> Return to list or table of elements

Ref. History of the recommended atomic-weight values from 1882 to 1997: a comparison of differences from current values to the estimated uncertainties of earlier values, Pure Appl. Chem., Vol. 70, No. 1, pp. 237-257, 1998.

Page last modified 7 June 2000
Copyright © 1997-2000 International Union of Pure and Applied Chemistry.